Heck, if all else failed, I'd drive that roll pin out and make a new clamp out of stainless. It doesn't look like it would be too much difficulty, as it is a single curve piece. Could be done. But I'm just a stickler for fixing things.
I'm seeing WAY too much of this kind of things nowadays....things breaking way too soon. And many times too expensive to fix....just buy another! Well, not me if - I can help it!